混凝土匀质性影响因素的研究investigationontheinfluence工学院.pdf

工程科技與教育學刊 第七卷 第二期 民國九十九年四月 第 318～324 頁 混凝土勻質性影響因素的研究 石 磊 1, 水中和 1, 王桂明 1, 杜志國 2 1. 武漢理工大學材料科學與工程學院, 武漢 430070 2. 內蒙古錫林浩特多倫養路工區, 锡林浩特 027300 E-mail: shilei0603@163.com 摘 要 本文采用离析度和集料分布图像法对混凝土的匀质性进行了綜合評價。試驗結果顯示，离析度、集料 离差度与强度差异率存在很好的线性相关性；新拌混凝土在制备过程中引起的微观和宏观泌水作用会在集 料界面处产生水分分布梯度，并最终导致硬化后混凝土界面过渡区内结构在不同位置存在明显差异；水灰 比的降低、矿物掺合料和外加剂的掺入能有效改善界面过渡区的均匀性。 關鍵詞:匀质性；显微硬度；界面过渡区 Investigation on the Influence Factors of Homogeneity of Concrete 1 1 1 2 Shi Lei , Shui Zhonghe , Wang Guiming , Du Zhiguo School of Materials Science and Engineering, Wuhan University of Technology,Wuhan 430070; 2. Xilinhaote Duolun Highway Management Work Area of Inner Mongolia, Xilinhaote 027300 Abstract In this thesis, aggregate segregation degree and image analysis method on the homogeneity of concrete conducted a comprehensive evaluation. The results showed that the degree of segregation and diversity of aggregate had a good linear relationship to compressive strength of different part of concrete; In the preparation process of fresh concrete, the micro-bleeding and macro-bleeding make the water content around the aggregate particles asymmetry, and influent the symmetry of the interfacial transition zone( ITZ) of hard concrete; The decrease of water content, mineral admixtures and superplasticizer can effectively improve the ITZ of concrete. Key words: homogeneity; micro-hardness; ITZ